Grinding wheel form dresser



Feb. 8, 1944. w F DALZEN 2,341,022l

GRINDING WHEEL FORM DRESSER Original Filved April 19. 1941 2 Sheets-Sheet 1 INV ENT OR.

Feb. s, 1944. W, DALZEN 2,341,022 I GRINDING WHEEL FORM DRESSER Original Filed April 19, .1941 2 Sheets-Sheet 2 Ma/ffy?.

Patented Feb. 8, 1944 GRINDING WHEEL FORM DRESSER William F. Dalzen, Grosse Pointe, Mich.

Original application April 19, 1941, Serial No. 389,263, now Patent No. 2,277,213, dated March Divided and this Vapplication December 1s, 1941, seria1No.42s,517

12 claims.

This invention relates to a grinding wheel form dresser, and more particularly to a dresser vof this type adapted for use in conjunction with a thread .grinding machine, wherein a work-piece is rotated and reciprocated on a suitable carriage past a rotatable abrasive grinding wheel with the cutting peripheral edge thereof coopera.- tively engaging transversely the surface of the work-piece for grinding a thread in the same.

From time to time the cutting edge of the grinding wheel is worn down, or is broken,.or chipped requiring a re-truing or resurfacing. Or on the other hand it may be desired to vary the shape orvangle of the sides of the peripheral grinding edge thereof. The grinding wheel form dresser hereinafter described in detail is therefore adapted for accomplishing the above purposes.

It is the object of this invention to provide a novel grinding wheel form dresser adapted to produce .various shaped surfaces in the edge of the abrasive grinding wheel for accurately grinding out various shapes of threads. Y

It is the further object of this invention to provide a manually actuatable form dresser with a plurality of diamond mountings for coopera- ,tively engaging the oppositeedges of the grinding wheel periphery when the latter is dressed. It is the further object of this invention to ,provide a plurality of simultaneously manually actuated diamond mounting means whereby said mountings may be brought to bear upon opposite edges of the grinding wheel at the same time.

It is the still further object herein to provide means for maintaining the-reciprocable diamond mounting supports entirely dust-free.

vIt is the further object herein to provide means for adjusting the angular inclination of the diamond mountings whereby a plurality of angles may be dressed in the peripheral edges ofthe grinding wheel.

It is the still further object herein to provide an auxiliary mechanism in conjunction with said form dresser for dressing the outer edge of the abrasive grinding wheel for providing thereon a curved surface, together with adjusting .means for regulating the degree of curvature.

Figure 4 is a partially sectioned elevational `viewof the diamond mounting and adjusting means for said grinding wheel dresser.v

The above drawings illustrate merelypreferable embodiments of the invention, it being expressly understood that it is not intended that the invention be limited thereby.

In the drawings, a grinding wheel dresser is generally indicated as A with its housing vertically and reciprocably mounted within the support I2 with frictionminimizing ball races or 'ways- |'3 interposed therebetween. Support |2 is joined to the vertically movable grinding wheel support or housing I4 and isadapted to move therewith.

Lever 2| has a lug on its end adapted to support the housing of the dressing mechanism A at point 22. Said housing while resting upon the end of lever 2| is longitudinally and reciprocably disposed within the vertical support I2; Said lever 2| is centrally pivoted at point123 to the movable housing Mwhich provides a movable. support for the pivot point 23.

The other endof the lever 2| also hasr a lug thereon for adjustable engagement with respect to the .column I9 at point |97. Said column be-.v ing fragmentarily shown in Figure 2 but more fully shown in Figures. 12, 3, 7 of the drawings of application Serial No. 389,263, of which the instant application is a divisional part, as above more fully set out.V c

An adjustable relation is maintained between lever 2| and column |9as the wheel supporting housing I4 is downwardly fed, whereby the dresser is permitted to properly engage the surface of the grinding Wheel 20 in operativedressing position.

A compensating screw 2| is longitudinally dis-y posed within a bracket member 2|" securedA to the column I9. A washer 22',V is secured upon the end of screw 2| by a nut 23'; and the end of lever 2| is beneath said Washer at point I9 whereby a retaining means is provided preventing rotation of lever 2|. v

VA calibrated nut Il is threadably disposed onJ the lower end of the `compensating screw `2| and thereby provides a manually operable adjusting means permitting lonf-,fitudinalv adjustment vof the compensating screw 2| whereby the lever 2 is correspondingly adjusted as desired.

The above dressing mechanism. is aform dresser adapted to obtain a plurality oi-angles and shapes in the peripheral edgeV on the abrasive grinding wheel 26| depending upon the formpf vthread desired. Y

By utilizing the support' l2 as iuustratea in' Figures 1 and 2, and the ball races or ways I 3 it is seen that dresser A is easily removable and interchangeable with any other type of dresser mechanism if desired.

Referring to Figures l through 4, the dresser housing has a pair of angularly adjustable members 9.7 and 98., one or" which is shown in sectioned detail in Figure v2l. Said member has oppositely disposed hollow cylindrical portions 99, Within the ends of which are inserted the hollow flanged sleeve bearing members |90 and |-0 The shaft |92 is reciprocably mounted within cylindrical members 99 and said Abearing mem.- bers, and has secured thereto a hollow diamond housing support |03. Said support is formed with annular cylindrical projections |04 and |05 disposed in spaced relation to the reciproable shaft |02. An annular cylindrical member |06 is joined to bearing member lill providing a space therebetween for .slidably receiving tbe cylindrical prejectlon i4 .of the .diamond kmourning .support ma.

The pll'lneinalY purpose of projections |04 and |115 and the cylindrical member lllfi is for .closing oir shaft .mi from the atmosphere, preventing dust from getting The shaits, |92 are Vfurther kent dust-free by means of the caps. i 02? removably secured within the. ends. of bearing members |09` and |01. It will be noted in this connection that it is absolutely essential thatthe reciprocable shafts M12-,be kept. dust-free, and by .the aboveA mechanism `this result isguaranteed.

A diamond mounting lill is secured within sup.- port |03, with the end of said mounting adapted to engage the peripheral edge of the grinding wheel 2 9as best seen in Figure 2.

It will be understood that a similar mounting is disposed within the member 99 for cooperatively engaging the other side of the peripheral edge of said grinding wheel.

When inoperative the diamond mountings are supported above and` out of contact with the grinding wheel 29; and are lowered for engagee ment'therewith when a dressing operation is desired. Said dressing operation is always from the topvof the wheel with the result that the possibilitylof wheel breakage is eliminated.A

For accomplishing the raising and loweringof said mountings a manually actuated handle |08 is employed, pivoted on its end at |99 to the dresser housing through the intermediate supports Ill!) which are pivoted at their lowerextremities to the rod A'bifurcated stirrup IIZ is pivotedat i i9 tothe handle |08 and is adapted for reciprocablemovement therewith. A guide member i3 'forming an integral part of pivotal shaft H transversely secured through the dresser housing is slidably disposed with in the stirrup H2 and provides a guide therefore.

A link H6 is pivoted at the lower extremity of said stirrup at point ||'|;'with its other end pivotally joined tothe diamond housing support |03 within the supporting member 93.

A similar link H8 is pivoted at ||9 to stirrup |-2 and is adapted to pivotally connect a similar diamond mounting support within the member 91; the detail of-Which is omitted in Figure 2 for purposes of simplicity.

Y Consequently by manipulation of handle |63' the diamond mounting supports |03 within their respective supporting members Sil-and 98 may be reciprocated whereby the diamond mountings |01 on both sides of the grinding wheel may be brought into and out of engagement with said grinding wheel for permitting the dressing operation. It will be noted, however, that the dressing operation is accomplished on the downward motion of the diamond mounting |01.

It will `be understood that various shapes and angles maybe dressed inthe peripheral edge of the grinding wheel. This is accomplished by providing an angular adjustment for members 91 and 99 which are pivotally supported within housing at points |20 with suitable bolts being provided for angularly securing the same. Said members have an additional opening at points 1.2i through which are disposed bolts |22 carried in asuitable slot within housing l, with nuts secured thereon for adjustment with respect to said housing.

For angularly adjusting members 91 and 98 screws |46 are threadabl-y journaled within suitable brackets |47 the` latter forming. a part `of housing of the .dressing.mechanism..

Members i2;3. and ,|24 have .oppositely disposed projections 1.48 which are cooperatively engaged .by the heads of screws 141i and washers :|49 .secured upon said screws in spaced relation to said heads.

4Consequently. with connections |.2ll and, y22 loosened, screws MB may bev manually adziusted for regulating the. angular relation of tixediamond mounting supports .i 03.

Members |23 and |24 are oppositely disposedin the top. or the supports` 9i and 9.8; and provide a means of measurementfrom aninterrnediate cen,- tral point to guarantee that, .both supports are disposed at the same complementaryzangles with respect to the grinding wheel. So provisionedijI is easily seen that both vsides of, the peripheral grinding wheel will be dressed-at thesame angle. They central pointv above referred` -to thoughY not included in the drawings. may. be arbitrarily marked upon the top edge of the housing as desired.

Furthermore by said adjustingY means. the dressing anglemay. be varied as and `when desiredvwhereby the dresser A is adapted to rdress a plurality of angles in the peripheral edge of a grindingwheel.

Referring to Figure 4- itis seen thattheshaft |02: is` splitk at its ends at'- points |-25= where by meansv of suitable adjusting screws |26 the diameter on the ends of-saidsha-ft may be'sli'ghtl-y increased fois takingl up lwear'r of saidr shaft or bearing membersA I-Ullland |0| Having described myinvention reference should newv be hadY to they claims which-followfor determining the scope of thisinvention.

I claim:

1. A grinding wheel dresser comprised or a housing, a pair of angularly adjustable diamond mounting supportspivotall-y secured therein, each support having a pai-r of oppositely disposed hollow membersA integral tl'ierevvith',y hollow-'cylindrical bearing members-disposedwithinsaid members, shafts slidably disposedy Within said bearingI members; diamondv mounting blocks joined to said shafts,y with diamonds therein adapted-to'concurrent-1y engage both peripheral edges of a grinding wheel, theopposite ends'of said blocks having annular' openings into which said bearing members extend, and a vcommon manually actuated means joined-` to the`A said diamond mountingA blocks 4for reciprocating-"the same and said shafts togethenin' the same-(1j.q

rection'withinsaid' bearing: members toward and .away .from said wheel. `ZLA grinding wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting `supports pivotally secured therein, each support having a pair of oppositely disposed hollow members integral therewith, hollowvcylindrical "bearing members disposed within said n'iembers, .shafts slidably disposed Within said 'bearing-"members, diamond mounting blocks joined tofsaidshafts, with diamonds therein 'adapted .to' concurrently engage both peripheral edges of a' grinding wheel, the opposite ends of v'said lblocks having annular openings into which said bearing members extend, a common manually actuated means joined to the said diamond mounting blocks forreciprocating the same and said shafts together in the same direction within said bearing members, and covering means for the outside ends of said bearing members, which together with said overlapping annular openings provide dust-free enclosures for said shafts.

3. A grinding Wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting supports pivotally secured therein, each support having a pair of oppostely disposed hollow members integral therewith, shafts slidably disposed within said members, diamond mountings secured to said shafts, adapted to concurrently engage both peripheral edges of a grinding wheel, a common manually actuated means joined to said mountings for reciprocating the same, and said shafts together in the same direction within said hollow members, said shafts being split at their ends with corresponding threaded openings, and adjusting screw members Within said openings.

4. A grinding wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting supports pivotally secured therein, each support having a pair of oppositely disposed hollow members integral therewith, shafts slidably disposed within said members, diamond mountings secured to said shafts, adapted to concurrently engage both peripheral edges of a grinding wheel, a common manually actuated means joined to said mountings for reciprocating the same and said shafts together in the same direction within said hollow members, oppositely projecting studs on said supports, and adjusting screw members threadably journaled on said housing joined to said studs for regulating the angular adjustment of said supports.

5. A grinding wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting supports pivotally secured therein, each support having a pair of oppositely disposed hollow members integral therewith, shafts slidably disposed within said members, diamond mountings secured to said shafts, adapted to concurrently engage both peripheral edges of a grinding wheel, a common manually actuated means joined to said mountings for reciprocating the same and said shafts together in the same direction within said hollow members, manually operable means in said housing joined to said supports ior regulating the angular adjustment thereof, and inwardly projecting studs on said supports providing measuring means to an intermediate central point between said supports.

6. A grinding wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting supports pivotally secured therein, hollow cylindrical bearing members disposed within said supports, shafts slidably disposed within said bearing members, diamond `mounting Ablocks joined to said shafts, with diamonds therein adapted to concurrently engage both peripheral edges of a grinding wheel, the opposite ends of said blocks having annular openings into which said bearing members extend, and a common manually actuated means joined to the said Adiamond mounting blocks for reciprocating the same and said shafts together within said bearing members towards and away from said wheel in the same direction.

7. A grinding wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting supports pivotally secured therein, hollow cylindrical bearing members disposed within said supports, shafts slidably disposed Within said bearing members, diamond mounting blocks joined to said shafts, with diamonds therein adapted to concurrently engage both peripheral edges of a grinding wheel, the opposite ends of said blocks having annular openings into which said bearing members extend, a common manually actuated means joined to the said diamond `mounting blocks for reciprocating the same and said shafts together in the same direction within said bearing members, and covering means for the outside ends of said bearing members, which together with said overlapping annular openings provide dust-free enclosures for said shafts.

8. A grinding wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting supports pivotally secured therein, shafts slidably disposed within said supports, diamond mountings secured to said shafts, adapted to concurrently engage both peripheral edges of a grinding wheel, a common manually actuated means joined to said mountings for reciprocating the same, and said shafts together in the same direction within said supports, said shafts being split at their ends with corresponding threaded openings, and adjusting screw members within said openings.

9. A grinding wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting supports pivotally secured therein, shafts slidably disposed within said supports, diamond mountings secured to said shafts, adapted to concurrently engage both peripheral edges of a grinding wheel, a common manually actuated means joined to said mountings for reciprocating the same and said shafts together in the same direction within said supports, oppositely projecting studs on said supports, and adjusting screw members threadably journaled on said housing joined to said studs for regulating the angular adjustment of said supports.

10. A grinding wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting supports pivotally secured therein, shafts slidably disposed within said supports, diamond mountings secured to said shafts, adapted to concurrently engage both peripheral edges of a grinding wheel, a common manually actuated means joined to said mountings for reciprocating the same and said shafts together in the same direction within said supports, manually operable means in said housing joined to said supports for regulating the angular adjustment thereof, and inwardly projecting studs on said supports providing measuring means to an intermediate central point between said supports.

11. A grinding wheel dresser comprised of a housing, a pair of angularly adjustable diamond mounting supports pivotally secured therein, shafts slidably disposed within said supports,

idiamond mountings ysecured `to said shafts, :adapted atoeoncurrentl-y engage both peripheral :edges o'f a .grinding Lwheel, `manually operable .means pivotall-y mounted above said housing,

slotted .operating means .depending therefrom,

,'oppositely disposed links joined .to said .operating means, andinterconnecting said diamond mount-.- Aings for vreciprocating .the .same .and said .shafts ltogether dn fthe `same direction -within said .sup- :ports towards .and .away if'rom-said Wheel, L said shafts being split at their .ends dWith correspond- .ing threaded openings, .and adjusting screw `members Within vsaid openings.

`Il2. A grinding wheel .dresser `eomprisedof a fhousing, .a pair of rangularly adjustable vdiamond 'l5 mounting supports .pivotally secured therein, each zsupport having .a pair Aof .oppositely `disposed V.hollow members at the ends thereof and integral therewith, shafts slidably disposed'mithin ,said members dia-mond mountings .seguredto said shafts, adapted to conpurrently engage hath peripheral iedges of la :grinding wheel, manually operable means `pi-i/,otally niouniied `abone said housing, .slotted operating :means v.depending therefrom, oppositely disposed links ,doinedto said operating .means 'and .interconnecting said .l0 Ldiamond :mountings :ier :reciprncating Vthe .same

andfsaid shafts together the same ,direction .within 'said .hollow members rtowszardsr `and .away from 'said wheel, .and means transversely dis.- :posed within said housing .and the slotdn .said operating .means :for limiting vlateral translatim thereof.. 

